Malicious PDF — malware analysis report

Static analysis result for SHA-256 a902a4753d0ce90e…

MALICIOUS

PDF

84.7 KB Created: 2021-07-09 13:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f62ba1ff419e2772779d90619fd04f SHA-1: 9a87dcc3e52915347983fc7f76c51e0e9c1723f2 SHA-256: a902a4753d0ce90e10eaf91a31050cab53a03fb62e817c9da1eba6cde6b93a4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/640aed5f4cad09114402e938bf6e49de/82608299939.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/subuzaw.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bac33dfc730231da874573d872ed1d87/82242109455.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be829aad15f---likejeregamaxugizuvaf.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/29510160469.pdf
    • https://alperbehang.nl/userfiles/file/77495057781.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a87136d24e3---zewaxas.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ab4d6869edd68d5d9174245260334512/51154461501.pdf
    • https://thaiahpa.com/flash/files/22252539022.pdf
    • http://svaz-podnikani.cz/files/file/pelesigosanerowuvozag.pdf
    • http://driver-jazda.pl/upload/file/94653581404.pdf
    • http://ehomeforeclosure.org/images/file/61685321544.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ced4de53---54944681975.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767960c33ef---pujafapetevokap.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6767057d2d0c248739578e38cbafa50d/riwakuk.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c001fb32b8d---ranoveruluw.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079bab35ef30---29924052865.pdf
    • http://crosswaysrecruitment.com/userfiles/file/nexizadaloxu.pdf
    • http://haniltm.kr/upfiles/editor/files/kigifuzaxulewibogijiguluz.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/55018fe66825be11c28baad2ca17a6d9/zibamajatixuvofib.pdf
    • http://progfin.pl/userfiles/file/14760062688.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f25f93cec---11365502714.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc089744eb---90819342652.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f10bf6d43f253e8c0d4bcf5ffc7b940b/16268669071.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+real+alien
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
font_01_sfnt_off000104a7.bin
69df9b29e1220aa07ec7c76b9363dd21a30e75bc351c6c2f70b9bd63837ad34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 17296 bytes
font_02_sfnt_off00013105.bin
9cd358f8bdc7c087e322b9402c7027b12cc2d568e1858b44ad6dbc51c3945b52
pdf-font-stream PDF embedded font (sfnt) at offset 0x13105 9696 bytes